EP4639724A1 - Rotor für eine elektrische maschine mit einem magneten, der vorsprünge aufweist - Google Patents
Rotor für eine elektrische maschine mit einem magneten, der vorsprünge aufweistInfo
- Publication number
- EP4639724A1 EP4639724A1 EP23833019.5A EP23833019A EP4639724A1 EP 4639724 A1 EP4639724 A1 EP 4639724A1 EP 23833019 A EP23833019 A EP 23833019A EP 4639724 A1 EP4639724 A1 EP 4639724A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnet
- rotor
- projections
- rotor according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew
Definitions
- the invention relates to a rotor for an electrical machine, with a rotor lamination stack comprising a plurality of rotor laminations stacked in the axial direction, which have a plurality of recesses arranged distributed in the circumferential direction and forming magnetic pockets, in each of which a magnet is inserted.
- the axial direction runs parallel to the axis of rotation of the rotor.
- Electric machines with such a rotor are increasingly being used in electrically powered vehicles or hybrid vehicles.
- the electric machine is mainly used as an electric motor to drive a wheel or an axle of the vehicle.
- the electric motor can be designed as a synchronous motor or an asynchronous motor, among other things.
- the electric motor is usually mechanically coupled to a gearbox for speed adjustment.
- the electric motor is usually electrically connected to an inverter, which generates an alternating voltage for operating the electric machine from a direct current supplied by a battery, in particular a multi-phase alternating voltage.
- the stator of an electrical machine has a stator core and stator windings. When a current is applied to the stator windings, a rotating electrical field is generated, which causes the rotor to rotate.
- the rotor lamination stack consists of a large number of axially stacked or lined-up rotor laminations. Some of the rotor laminations have recesses that form magnetic pockets for magnets. After the magnets have been inserted into the magnetic pockets, a liquid casting compound is usually introduced into the rotor lamination stack, which is hardened by the application of heat. Care must be taken to ensure that the The rotor lamination package consisting of the stacked rotor laminations is sealed to prevent the casting compound from leaking out. The tolerances of the magnet pockets and the magnets are selected so that the magnets can be inserted into the magnet pockets without jamming or jamming.
- the aim is for the magnets to be located as far radially outward as possible in the magnet pockets, as this is when the electromagnetic force is at its maximum.
- a magnet is located in a radially inner position or that the position is undefined.
- a rotor in which the magnets are positioned radially outward in the magnet pockets. Such a radial direction is perpendicular to the axis of rotation of the rotor.
- the invention is therefore based on the object of specifying a rotor in which the magnets in the magnet pockets are positioned radially outward.
- a magnet has at least two projections on an outer side.
- the outer side can be one of the longer outer sides of the magnet.
- the size of the projections and the size of the magnet are matched to the size of the recess or to the size of the magnet pocket that accommodates the magnet, so that the magnet can be positioned in the magnet pocket without play.
- the magnet touches an inner side of the recess with the two projections on its outer side, so that its position is fixed. This has the advantage that complex casting with a casting compound can be dispensed with.
- the rotor according to the invention is therefore characterized by a shorter production time compared to the prior art.
- the at least two projections on the outside of the magnet are directed radially inwards.
- the magnet is inserted into the recess with the projections directed towards the rotation axis of the rotor. This ensures that the magnet is located as far radially outwards as possible.
- both projections it is also possible for both projections to be directed radially outwards.
- a magnet has two or more projections on its outside. In principle, however, it is also possible to provide only a single such projection. In order to prevent the magnet from tipping over, it is also possible for the projection to extend over a larger area of the outside of the magnet.
- a magnet can also have more than two such projections, for example three, four, five, six, seven, eight, nine, ten, eleven or twelve projections located on the same outer side of the magnet.
- a further development of the invention provides that the at least two projections are designed in such a way that an outer side of the magnet opposite the projections lies flush against an inner side of the magnet pocket. This improves the hold of the magnet in the magnet pocket so that the magnet cannot slip. In particular, the magnet can thus safely maintain a radially outermost position in the magnet pocket.
- the two projections arranged on the outside of the magnet are spaced apart from an edge of the magnet.
- the two projections can in particular be offset from an edge towards the middle of the outside.
- the projections can also be placed directly on an edge of the magnet.
- the projections can each border on an edge of the magnet or touch the edge.
- a projection can have a semicircular, triangular or rectangular cross-section. With regard to its three-dimensional shape, a projection can be designed as a hemisphere, three-sided pyramid, four-sided pyramid or cuboid.
- the shape and size of the projections are selected so that a magnet is held in the magnet pocket by friction. The friction between the magnet and the inside of the magnet pocket holds the magnet securely in the desired position.
- the rotor according to the invention can also be designed in such a way that the rotor laminated core is divided into several laminated core segments in the axial direction, with two adjacent laminated core segments being rotated relative to one another in the circumferential direction.
- the rotation is typically a few degrees. This measure counteracts the formation of a cogging torque.
- a projection can preferably extend over the entire axial length or over part of the axial length of the magnet.
- the axial length of the magnet means the length of the magnet accommodated in the magnet pocket along the axis of rotation of the rotor.
- the projections can be arranged at each corner of the magnet. Care must be taken to ensure that the projections do not collide with the contour of the magnet pocket so that the magnet can be easily inserted into the magnet pocket.
- the corners and radii of the magnet and magnet pocket can be designed or dimensioned in a suitable manner.
- the rotor lamination stack can also have end plates, each of which is arranged on an axial side of the rotor lamination stack.
- the end plates can be screwed to the rotor lamination stack using through-bolts.
- the end plates can be attached to the rotor lamination stack in another way, for example by gluing or stamping.
- the invention also relates to a vehicle having at least one such electric machine by which it can be driven.
- Fig. 1 is a sectional view of a rotor according to the invention
- Fig. 2 is a plan view of a rotor lamination
- Fig. 3 a detail of a rotor sheet with a magnet inserted in a magnet pocket
- Fig. 4 shows a further embodiment of a rotor sheet with a magnet inserted in a magnet pocket
- Fig. 5 shows another embodiment of a rotor sheet with a magnet inserted in a magnet pocket
- Fig. 6 shows a vehicle with an electric machine according to the invention.
- Fig. 1 is a sectional view of a rotor 1 for an electrical machine.
- the rotor 1 comprises a rotor lamination stack 2, which consists of a plurality of rotor laminations 3 stacked in the axial direction.
- the rotor laminations 3 have a central opening into which a rotor shaft 4 is pressed in a rotationally fixed manner.
- Fig. 1 it can be seen that the rotor core 2 has through openings 5. On the outer circumference of the rotor core 2 there are magnet pockets 6 into which, in the assembled state, several magnets are inserted one above the other in the axial direction.
- Fig. 2 shows a schematic plan view of a single rotor sheet 3, which does not necessarily correspond in terms of details to the rotor sheets of the rotor sheet stack 2 shown in Fig. 1.
- the rotor sheet 3 comprises magnet pockets 6, 7 distributed over the circumference for magnets that differ in size and shape. The shape and number of magnet pockets can vary with the number of magnetic poles of the rotor.
- the magnet pockets 6, 7 are each arranged in pairs.
- the rotor sheet 3 also comprises through openings 5 arranged between the larger magnet pockets 6, which are used to screw the rotor sheet stack 2.
- end plates can be attached to a rotor sheet stack by means of adhesive bonding or punching.
- Fig. 3 is a plan view and shows a detail of a rotor lamination stack 2 near the outer circumference.
- the rotor lamination stack 2 which consists of stacked rotor laminations, has a magnet pocket 8 in which a magnet 9 is inserted.
- the magnet 9 has the basic shape of a cuboid, on its radially inward-facing outer side 10 two projections 11 are formed, which triangular cross-section. Both projections 11 are spaced from an edge of the magnet 9 to the middle of the outside 10. In the exemplary embodiment shown, the projections 11 extend over the entire axial length of the magnet 9.
- the size of the magnet 9 having the projections 11 and the size of the magnet pocket 8 are coordinated with one another, taking into account the tolerances, so that a magnet 9 inserted into the magnet pocket 8 is held there with friction.
- the projections 11 touch a first inner side of the magnet pocket 8.
- the opposite outer side 12 of the magnet 9 touches a second inner side of the magnet pocket 8.
- the magnets 9 can be inserted into the magnet pockets 8 with little effort and are automatically held in this position. Additional positional securing, for example by introducing a casting compound, is optional.
- the previously unmagnetized magnet can be magnetized with an external magnetic field. This increases the magnetic attraction of the magnet 9 on the outside 12 and its tendency to nestle precisely there.
- Fig. 4 is a similar view to Fig. 3 and shows a further embodiment of a rotor core 2 with a magnet 13 inserted in a magnet pocket 8, the projections 14 of which are designed as hemispheres.
- the projections 14 are located directly on an edge of the outside of the magnet 13. The projections 14 cause the magnet 13 to be in the radially outermost position, so that the magnetic field acting outside the rotor is maximum.
- Fig. 5 is a similar view to Fig. 3 and 4 and shows a rotor core 2 with a magnet 15 whose projections 16 are rectangular. The projections 16 are supported on the radially inner inside of the magnet pocket 8. The outside of the magnet 15 lies flat against the radially outer inside of the magnet pocket 8.
- Fig. 6 shows a vehicle 17 with an electric machine 18 with a rotor 1, which has a rotor shaft 19, and with a stator 20 surrounding the rotor 1, which has stator windings. The electric machine 18 serves to drive an axle of the vehicle 17.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022134556.4A DE102022134556A1 (de) | 2022-12-22 | 2022-12-22 | Rotor für eine elektrische Maschine mit einem Magneten, der Vorsprünge aufweist |
| PCT/EP2023/085607 WO2024132782A1 (de) | 2022-12-22 | 2023-12-13 | Rotor für eine elektrische maschine mit einem magneten, der vorsprünge aufweist |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4639724A1 true EP4639724A1 (de) | 2025-10-29 |
Family
ID=89428646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23833019.5A Pending EP4639724A1 (de) | 2022-12-22 | 2023-12-13 | Rotor für eine elektrische maschine mit einem magneten, der vorsprünge aufweist |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4639724A1 (de) |
| CN (1) | CN120380685A (de) |
| DE (1) | DE102022134556A1 (de) |
| WO (1) | WO2024132782A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000228838A (ja) * | 1998-12-01 | 2000-08-15 | Toyota Motor Corp | 永久磁石モータ |
| DE10131474A1 (de) * | 2001-06-29 | 2003-05-28 | Bosch Gmbh Robert | Elektrische Maschine |
| CN103026585B (zh) * | 2010-07-23 | 2014-07-09 | 丰田自动车株式会社 | 转子和ipm马达 |
| JP5310790B2 (ja) * | 2011-06-10 | 2013-10-09 | 株式会社デンソー | 回転電機のロータ |
| JP2015195638A (ja) * | 2014-03-31 | 2015-11-05 | ダイキン工業株式会社 | ロータ |
| JP2018129938A (ja) * | 2017-02-08 | 2018-08-16 | 本田技研工業株式会社 | 回転電機 |
| JP7263698B2 (ja) * | 2018-05-28 | 2023-04-25 | Tdk株式会社 | 永久磁石及びモータ |
-
2022
- 2022-12-22 DE DE102022134556.4A patent/DE102022134556A1/de active Pending
-
2023
- 2023-12-13 CN CN202380088057.9A patent/CN120380685A/zh active Pending
- 2023-12-13 WO PCT/EP2023/085607 patent/WO2024132782A1/de not_active Ceased
- 2023-12-13 EP EP23833019.5A patent/EP4639724A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN120380685A (zh) | 2025-07-25 |
| DE102022134556A1 (de) | 2024-06-27 |
| WO2024132782A1 (de) | 2024-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AT522711A1 (de) | Stator für eine Axialflussmaschine | |
| EP2491640B1 (de) | Bürstenloser gleichstrommotor mit stromloser hemmung | |
| EP2115855A1 (de) | Elektrische maschine | |
| EP1695429B1 (de) | Elektrische maschine | |
| EP1471621A2 (de) | Rotorkörper für einen Elektromotor | |
| DE112009002090T5 (de) | Drehende eletrische Maschine | |
| EP3189582B1 (de) | Rotor einer elektrischen maschine, elektrische maschine und verfahren zum herstellen eines rotors einer elektrischen maschine | |
| WO2018108492A1 (de) | Elektrischer antriebsmotor sowie diesen enthaltendes haushaltsgerät bzw. motorbaukasten | |
| EP0954087A1 (de) | Elektrodynamisches Getriebe und Kreiselpumpe mit einem derartigen Getriebe | |
| EP4191839A1 (de) | Rotor für eine elektrische maschine mit einem axialen kühlkanal in einem blechpaket | |
| DE102010054847A1 (de) | Bürstenloser Elektromotor oder Generator in Schalenbauweise | |
| EP3309934A1 (de) | Elektrische maschine | |
| DE102019212256A1 (de) | Rotor mit minierten Streustegen | |
| DE102005047771A1 (de) | Rotoranordnung für eine elektrische Maschine und Verfahren zum Herstellen der Rotoranordnung | |
| DE102016212022A1 (de) | Rotor | |
| EP2876789B1 (de) | Verfahren zur Herstellung eines Rotors | |
| DE102007013738A1 (de) | Klauenpolmaschine | |
| DE102021211716A1 (de) | Rotoranordnung für eine elektrische Maschine | |
| WO2020007766A1 (de) | Rotor | |
| EP2384532A1 (de) | Gleichstrommotor | |
| WO2024132782A1 (de) | Rotor für eine elektrische maschine mit einem magneten, der vorsprünge aufweist | |
| DE202014100199U1 (de) | Elektromotor | |
| EP2652862B1 (de) | Maschinenkomponente für eine elektrische maschine | |
| EP3154176A1 (de) | Elektrischer antriebsmotor | |
| DE19648758A1 (de) | Dauermagnetisch erregte elektrische Maschine mit Rotorrückschluß |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20250623 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |